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RS232 (9W D plug)
RS232 (9-pin D-plug)
A 9-way D-type plug provides RS232 communications to third party devices, this is typically a temperature sensing interface. It provides one transmit and receive signal as well as CTS and RTS lines for handshaking. DTR indicates to the other device that this device is powered.
| Pin | Function |
|---|---|
| 1 | Reserved |
| 2 | RX_IN |
| 3 | TX_OUT |
| 4 | DTR_OUT |
| 5 | 0 V |
| 6 | Reserved |
| 7 | RTS_OUT |
| 8 | CTS_IN |
| 9 | Reserved |
| Shell | Screen |